In bread machine pan, place the first 6 ingredients in order suggested by manufacturer. Select dough setting (check dough after 5 minutes of mixing; add 1-2 tablespoons water or flour if needed). , When cycle is completed, turn dough onto a lightly floured surface. Punch down dough; cover and let rest for 15 minutes., Meanwhile, place garlic in a small microwave-safe bowl. Drizzle with 1/4 teaspoon oil. Microwave on high for 20-60 seconds or until softened. Mash the garlic., Roll dough into a 12x10-in. rectangle. Transfer to a well-greased baking sheet. Cover and let rise in a warm place until slightly risen, about 20 minutes., With fingertips, make several dimples over top of dough. Brush dough with 1 tablespoon oil. Bake at 400° for 10 minutes or until lightly browned. , Meanwhile, in a large skillet, saute onions in remaining oil until tender. Add the chipotle peppers, salt and mashed garlic; saute 2-3 minutes longer. Sprinkle over dough. , Bake until golden brown, 10-15 minutes longer. If desired, top with chopped chives. Cut into serving portions; serve warm. Freeze option: Freeze cooled focaccia squares in freezer containers, separating layers with waxed paper. To use, reheat squares on an ungreased baking sheet in a preheated 400° oven until heated through.